Signature | Description | Parameters | |
---|---|---|---|
void rename_column (const char *from, const char *to); |
It renames column named from to to. If column from does not exists, it throws an exception |
from: Current column name. to: New column name |
static void test_rename_column() { std::cout << "\nTesting rename_column() ..." << std::endl; std::vector<unsigned long> idx = { 123450, 123451, 123452, 123453, 123454, 123455, 123456, 123457, 123458, 123459, 123460, 123461, 123462, 123466 }; std::vector<double> d1 = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 }; std::vector<double> d2 = { 8, 9, 10, 11, 12, 13, 14, 20, 22, 23, 30, 31, 32, 1.89}; std::vector<double> d3 = { 15, 16, 17, 18, 19, 20, 21, 0.34, 1.56, 0.34, 2.3, 0.1, 0.89, 0.45 }; std::vector<int> i1 = { 22, 23, 24, 25, 99, 100, 101, 3, 2 }; MyDataFrame df; df.load_data(std::move(idx), std::make_pair("col_1", d1), std::make_pair("col_2", d2), std::make_pair("col_3", d3), std::make_pair("col_4", i1)); std::cout << "Before rename" << std::endl; df.write<std::ostream, double, int>(std::cout); df.rename_column("col_2", "renamed_column"); std::cout << "After rename" << std::endl; df.write<std::ostream, double, int>(std::cout); }